<script lang="ts" setup name="XtxCarousel">
import { BannerItem } from '@/types/data'
import { ref, PropType, onMounted, onBeforeUnmount } from 'vue'
// const {
//   list,
//   auto = false,
//   time = 3000
// } = defineProps<{
//   list: BannerItem[]
//   auto?: boolean
//   time?: number
// }>()

const props = defineProps({
  list: {
    type: Array as PropType<BannerItem[]>,
    required: true
  },
  auto: {
    type: Boolean,
    default: false
  },
  time: {
    type: Number,
    default: 3000
  }
})
// 当前显示的图片索引
const active = ref(0)
// 点击左侧按钮
const prev = () => {
  active.value = active.value === 0 ? props.list.length - 1 : active.value - 1
}
// 点击左侧按钮
const next = () => {
  active.value = active.value === props.list.length - 1 ? 0 : active.value + 1
}
// 定时器id
const timeId = ref(0)

// 自动轮播
onMounted(() => {
  // console.log(props.list)
  // if (!props.auto) return
  // timeId.value = window.setInterval(next, props.time)
  mouseleaveFn()
})
// 组件销毁时停止轮播
onBeforeUnmount(() => {
  // if (!props.auto) return
  // window.clearInterval(timeId.value)
  mouseenterFn()
})
// 鼠标经过 图片是停止轮播图 =>关闭定时器
const mouseenterFn = () => {
  if (!props.auto) return
  window.clearInterval(timeId.value)
}
// 鼠标离开 打开轮播图  =打开定时器
const mouseleaveFn = () => {
  if (!props.auto) return
  timeId.value = window.setInterval(next, props.time)
}
</script>

<template>
  <div class="xtx-carousel">
    <!-- {{ list }} -->
    <ul class="carousel-body">
      <li class="carousel-item" :class="{ fade: active === index }" v-for="(item, index) in list" :key="item.id" @mouseenter="mouseenterFn" @mouseleave="mouseleaveFn">
        <RouterLink to="/">
          <img :src="item.imgUrl" :title="item.id" />
        </RouterLink>
      </li>
      <!-- <li class="carousel-item">
        <RouterLink to="/">
          <img src="http://yjy-xiaotuxian-dev.oss-cn-beijing.aliyuncs.com/picture/2021-04-15/1ba86bcc-ae71-42a3-bc3e-37b662f7f07e.jpg" alt="" />
        </RouterLink>
      </li>
      <li class="carousel-item">
        <RouterLink to="/">
          <img src="http://yjy-xiaotuxian-dev.oss-cn-beijing.aliyuncs.com/picture/2021-04-15/1ba86bcc-ae71-42a3-bc3e-37b662f7f07e.jpg" alt="" />
        </RouterLink>
      </li> -->
    </ul>
    <a href="javascript:;" class="carousel-btn prev"><i class="iconfont icon-angle-left" @click="prev"></i></a>
    <a href="javascript:;" class="carousel-btn next"><i class="iconfont icon-angle-right" @click="next"></i></a>
    <div class="carousel-indicator">
      <span :class="{ active: active === index }" v-for="(item, index) in list" :key="item.id" @mouseenter="active = index"></span>
    </div>
  </div>
</template>

<style scoped lang="less">
.xtx-carousel {
  width: 100%;
  height: 100%;
  min-width: 300px;
  min-height: 150px;
  position: relative;
  .carousel {
    &-body {
      width: 100%;
      height: 100%;
    }
    &-item {
      width: 100%;
      height: 100%;
      position: absolute;
      left: 0;
      top: 0;
      opacity: 0;
      transition: opacity 0.5s linear;
      &.fade {
        opacity: 1;
        z-index: 1;
      }
      img {
        width: 100%;
        height: 100%;
      }
    }
    &-indicator {
      position: absolute;
      left: 0;
      bottom: 20px;
      z-index: 2;
      width: 100%;
      text-align: center;
      span {
        display: inline-block;
        width: 12px;
        height: 12px;
        background: rgba(0, 0, 0, 0.2);
        border-radius: 50%;
        cursor: pointer;
        ~ span {
          margin-left: 12px;
        }
        &.active {
          background: #fff;
        }
      }
    }
    &-btn {
      width: 44px;
      height: 44px;
      background: rgba(0, 0, 0, 0.2);
      color: #fff;
      border-radius: 50%;
      position: absolute;
      // top: 228px;
      top: 50%;
      transform: translateY(-50%);
      z-index: 2;
      text-align: center;
      line-height: 44px;
      opacity: 0;
      transition: all 0.5s;
      &.prev {
        left: 20px;
      }
      &.next {
        right: 20px;
      }
    }
  }
  &:hover {
    .carousel-btn {
      opacity: 1;
    }
  }
}
</style>
